Grinding wheel spindle reciprocating mechanism



Sept. 26, 1933. c. G. FLYGARE GRINDING WHEEL SPINDLE RECIPROCATING MECHANISM Filed Feb. 25, 1928 2 Sheets-Sheet 2 I IIIIIIIII, a

I gmve'ntoiz 46 45 Cor/G/Zyorc' 93 1, g mw s Patented Sept. 26, 1933 I I f I 1 7 977 UNI-TED STA TES- PAT C I I 1,927,917" I f 7'1"" Y I GRINDING WHEEL SPINDLE RECIPRO 'CATING MECHANISM Carl G. Flygare, Worcester, Mass., assignor to Norton Company, Worcester, Mass, a corpo-H ration of Massachusetts Application February 25, 1928. Serial No. 256,894. p V I I 15 Claims. 01. 51 -39 I x This invention'relates to grinding machines the prior patent to Norton No. 762,835,.dated N 1 and more particularly to a'mechanismfor re- June 14, 1904. As shownin the drawings, a ciprocating the grinding wheel axially during the grinding wheel: '10 is mounted on a rotatable V grinding operation. wheel spindle '11'which'inturn is supported by. 1

5 In accordance with my invention I have prosuitable'bearings 12 in thewheel slide 13. Y The '60 vided a mechanism to communicate a reciprowheel spindle maybe driven by a belt 14 and catory movement to the grinding wheel spindle pulley 15 from anysuitable source of power. which will produce-an even wear of the wheel In accordance'with thisj invention, it is pro-' 7 surface and prevent grain markings on the Work posed to providea-wheel spindle reciprocating 10 surface. For certain grinding operations, such mechanism which is driven automatically by the 65 as when grinding adjacent to a shoulder, it is rotation of the spindle and thereby eliminating desirable that the wheel beheld axially im-' the use "of aseparate drive for this purpose. movable during the grinding operation. In addition, a manually controllabledevice is It is one objest of this invention to provide v provided for throwing the mechanism intofand 5 a simplified mechanism in which the-grinding outof operative relation ith thewheel spindle-'." l

wheel spindle may be reciprocated axially, or in This device is' so constructed and arranged that which, by movement of a" manually operable the'mechanism may be attached to a grinding. lever, the operator may stop the reciprocation machineof standard construction.- An adjustfor shoulder grinding. 1 ment is'provided sothattheoperator may varyu It isa further object of this invention to prothe length of the reciprocatory movement of the 7 vide a suitable locking device in: combination grinding wheel spindle according to the charwith an adequate end thrust bearing to mainacter of work to be ground in-themachine'Q tain the grinding wheel spindle axially immov- In the specific embodiment illustrated in they able during the grinding operation when no drawings, a simplified constructiorihas beendis reciprocation is desired. I closed in which the wheel spindle 11 is 'pro- It is still a further object to provide a simplivided with a reducedportion 20 having a screwfied arrangement whereby the length of reciprothreaded extension to provide attachment to the cation may be varied for different types of work. reciprocating mechanism. In case the recipro- Other objects will be apparent from the foleating mechanism is not required, the threaded lowing disclosure. 1 7 "extension may be employed in the usual manner 7 One embodiment of-this'invention is illustratfor receivingthe end thrust bearings; hence, the ed in the drawings in which like reference nuordinary'wheel spindle construction ma'y be emmerals indicate like parts; i ployed merely by removing the collar and flange Fig. 1 is a front elevation of the wheel slide portion adapted toreceive'the end thrust and; j 35 having the improved reciprocating mechanism attaching the housing '22 carlrying the wheel v attached thereto; i spindle reciprocating mechanism'to the end of Fig. 2 is an enlarged cross-sectional view the'wheel slide and spindle. I V I v: taken approximately on the 1ine'2-2 of Fig. 1; In, order to reciprocate the wheel spindlet a I I Fig. 3 is an enlarged longitudinal section taken worm 23 is mounted'on the end or the, spindle 40 approximately on the line 3--3 of Fig. 2;" and meshes with a worm gear 24. The gear 24. Fig. 4 is a cross-sectional View taken apis provided with an extended hub 25 which is proximately on the line 44 of Figsql and 3'; journaled in the bearing 26 in the housing 22. Fig. 5' is an enlarged fragmentary front elehe Qther Side Of the a is P v Wit an vation showing the mechanism for starting or c ntric pin 9 iSj p y Connected stopping .the reciprocation; by a link3l with a: pin 32 on the lower end Fig. 6 is an enlarged fragmentary viewsimilar aleVeI 33. 8 QI3 is pivo ally mountedv to that shown in Fig. 5 but with the lever in On a p in the 1 1 6 P i of the h us position to stop reciprocation of the table" and The 3 m be connected wi h? having parts broken away to more clearly show d the w l'sp l x nsi y any S it-- the construction; and i Y able mechanism, such as a' self-aligning ball Fig. "7 is an enlarged fragmentary View of the h' 'ust hearing, The outer member 37 t mechanism for adjusting the length of reciprob a is Supp t d h p r tfi in t cation of the wheel spindle as illustrated in Fig. 4. level" 33 an h l in D bY 1139 V This mechanism is applicable to various types which is screw-threaded into t ope end O of grinding machines such as that disclosed in Saidaperture. The inner niember io of'theball 'the spindle.

thrust bearing as the spindle reciprocates the' bearing is mounted on a reduced extension 42 of the worm 23 and is held in position by a collar 43 which is screw-threaded onto a further reduced portion-44 of the worm 23. It will be readily seen'that when thespindle 11 is rotated,

the worm 23 and the worm gear 24 are rotated.

thereby transmitting motion through the crank pin 30 andlink 31 to the lever 33' which in turn,

is connected to theextension on the wheelspin dle 11 to import a reciprocatory movement ;.to By utilizing a self-aligning ball ball bearing will readily align itself.

' 46 which is provided with a recess 47 adapted A further. feature of the invention involves a mechanism which is so constructed and arranged that the operator may readily stop or start" the reciprocation when desired. In the preferred construction, a mechanism is provided whereby the connecting link or .rod31 is provided with an. enlarged end portion 45 having an opening to fit the pin 32. The lower portion of the open- I ing. 46 is enlarged 'so that byraising the link ;transmitting any movement to the pin 32 and lever v33 and consequently; no axial reciprocation qmeans may be utilized to raise this link to an inoperative position and to simultaneously lock .thelever 33 against movement to hold the spin dle in a predetermined and fixed grinding position. As illustrated in' the drawings, a slide 50 is-mounted to slide in vertical ways and is pro- 31, thelink may travel the distance equal to the movement of the, eccentric pin without to the" grinding wheelispindle ,11. Anys'uitable vided with an irregularly shaped opening 51 (Fig.6) 'The opening 51 is so shaped that when the slide 5 0 is raised, the recess 52 ofthe openw, ing will engage the pin 32 and therebylock the lever 33 against movement. Asthe slide 50 is raised, a projection 53 of the slide engages the v under-surface of ,theportion of the link 31 and raises it into -a position such as that shown I in Fig. 6, 'sothat the pin 32 is out of engagement with the recess 47 of the opening 46. It w'ill be readily apparent from this 'construction that when the slide is in its lowerposition, the recess 47 of the opening 46 in link 31 will engage the pin 32 andther'eby. transmit a re- ,enlarged end 450i the-lever '31, therebydisengaging the recess 47 from the pin-32and brings the recess 52 of the aperture 51into engagement with the pin 32, thereby locking the lever33 ciproc atory 'movement to the grinding wheel-f spindle. As the slide 50 is raised, it raises the and preventing axial-reciprocation of the grind- 7 ing wheel spindle. In this position of the. slide.

" the thrust of the grinding wheel spindle isitaken by the ball. thrust bearing, thereby preventing any movement of the spindle while in a locked position. p s 4 .A mechanism is provided to raise and lower 1 the slide 59 so as to start and stop reciprocation. In the preferred construction, as illustrated in the drawings, alever 55 -is.mounted on the outeriend of astud .56 supported, in a bearing 57. in the housing 22.- The inner end of the stud 56 is prof vided'with a crank arm 58 havingacrank pin 59 engaging a horizontalslotfio in the upp r end of 'islide 5o. When the slide. is in its lower position, thatis, when the mechanism 'is connected; to

. reciprocate the. wheel spindle; the lever 55 is positioned' as shown; in Fig. 5ythepin 59. in this position being in a horizontal plane passing through the centerof the stud 56. When it is desired to stop reciprocation, the. operator moves the lever the entire face of the grinding wheel may be in contact with the work during the grinding operation. In the preferred construction a simplified 01" the hub 25.

, 1. A grinding 55froin the position shown in Fig. 5 toward the I right so that the lever is located as shown in Fig. 6 and thepin 59 has been raised to a position in a vertical plane above'the center of the stud 56, thereby raising the slide 56 so that the recess 52 of the opening 51 engages the pin 32 and thereby locks the lever 33 against movement. In certain classes of werk; it is desirable that the length of reciprocation may be varied so that arrangement has been illustrated inwhich the crank pin3s) is integral with but eccentric to '21..

shaft so that by turning 'the shaft 65 the eccentricity of theflcrank pin SO may be varied relative to .the hub portion 25 of the gear 24. The shaft 65 is rotatably mounted within the hub portion 25 so that its axis is-eccentricto the axis By turning the shaft 65. the crank pin 3Q 1'nay be brought into substantial alignment with the axis of the worm gear'24 so that it will not transmit a recipro'catory motion to'the. wheel spindle, or may beswung to vary its eccentricity to give the desired stroke to the g rinding wheel; spindle. 1 g g In order that the'path oi reciprocationmay be readilyvaried'an adjusting deviceis mounted on the gear 2 4 for varying the eccentricity ofqthe crank pin,30.. In the preferredconstruction, 1 however; a collar 67 is loosely mounted onthe shaft 65 and has a projecting 'rlange 68, surrounding the collar 69. A collar 71 is s'lidably keyed to the outer end of the shaft 65 by akey 72 and is locked in position by a nut threadedjonto'fi the outer en'd of the shaft 65. --Thecollar 67-.is

provided with a pin 75 which projects beyond the face of, the collar 67 and engages an aperture 76 It will be noted in Figs. 4-and 7 r in the-collar 71. that the collar 71 is provided with a plurality or. 4. apertures so that by'slacking oif thenut'70 and sliding the collar 71 axially to disengage the pin 75 from the aperture '76, the shaft 65 maybe rotated to bring the desired aperture in the collar 68 into alignment with the pin 75, thereby posi-'-i tioning the crank pin 30 in one of several predetermined positions on the'g ear 24and varying its eccentricity therewith to produce reciprocatory movement of the grinding Wheel spindle of the 97 desired length. After they collar 68. is rotated ml bring the desired aperture 76 into alignment with the pin 75, the'collar 68 is moved axially into operative position see Fig. 4) and thenlocked in position by the nut 70. I I

In the operation of this mechanism, the joper ator first removes the cover'79 from the housing 22 and adjusts the eccentricity of the crank pin 30 as above described to give the desired length of 1 stroke to the grinding wheel so that the entire face of the grinding-wheel contacts with the; sure face of, the work during the grinding operation.

The operator then locks the pin 30 in the adjusted clairnas new and desire to secure'by lietters Patentis:- 3 .1 r A 7 wheel ,spindle reciprocatin mechanism comprising a wheel spindle, a rotatable driving member, an oscillatable yoked mem-,

, ber connected to reciprocate the spindle while it against longitudinal movement.

rotates, a crankarm driven by the driving member, releasable connections between the crank arm and the yoked 'member, a slidable member having aprojection adapted to contact with said crank arm to'release'said connections, said slid- I able member having a slot adapted to engage said yoked member .and .hold the wheel I spindle 2'. A grinding wheel spindle. recipr eating mechanism comprising a wheel spindle, va'rotatable driving member, an oscillatable yoked member connected to reciprocate the spindle while it rotates, a crank arm driven by the driving members, the crank arm and yoked member having one a slot and the other a pin which interfit, the

a rotatably driven member, a lever pivotally mounted in the frame, releasable connections between said member and lever to oscillate the latter, a locking device for holding the lever stationary, and an end thrust bearing for the spindle carried by the lever and connected to the spindle.

to transmit the oscillation of the lever to reciprocate the spindle or to hold the latter axially immovable in a predetermined position.

4. A grinding wheel spindle reciprocating mechanism comprising a frame, a wheel spindle, a rotatable crankpin, gears connecting said spindle and pin to rotate the latter, an oscillatable,

lever pivotally-mounted in said frame, a thrust bearing supported on said lever and connected with the end of said spindle, a connecting rod having one end connected to said pin and the other end adapted to engage a projection on the lower end of said lever and manual means to disconnect said rod from said lever and to lock said lever in its central position and prevent reciprocation'of the wheel spindle.

5. A grinding wheel spindle reciprocating mechanism comprising a wheel spindle, a rotatable crankpin, direct driving connections between said spindle and pin to revolve the latter, connections between said pin and the end of said spindle to reciprocate the latter and manually operable means to vary the eccentricity of said crankpin and thereby'varythe length of reciprocatory motion of the wheel spindle.

6. A grinding wheel spindle reciprocating mechanism comprising a frame, a wheel spindle, a rotatable crankpin, a direct driving connection between said spindle and pin to rotate the latter, an oscillatable lever pivotally mounted in said frame, a connecting rod engaging said pin and connected to the other end of said lever, means connecting said lever to the end of said spindle, and means to vary the eccentricity of the pin to vary the length of the reciprocatory movement of the wheel spindle. I

7. A grinding wheel spindle reciprocating mechanism comprising a wheel spindle, a rotatable crankpin, means connecting said pin with the spindle to revolve the pin, releasable connections between the pin and the spindle to reciprocate the latter, a manually operable mechanism spindle reciprocating a rotatablecrankpin, means connectingsaid spindle and pin to rotate the latter, an oscillatable lever pivotally mounted in said frame, a connecting rod engaging said pin and connected tothe other 'end of said lever, means. connecting said lever to'the end 'of'said spindle, means to-vary the eccentricity of the'pin to vary the length of the reciprocatory movement and amanually-open able mechanism to disconnect said connecting rod and lover and lock said =lever against oscillating movement thereby preventing, reciprocation of. the wheelspindle. H 1

9. A grinding wheel spindle reciprocating mechanism comprising awheel spindle, a rotat- "able membendirect driving connections between said spindle and said member to rotate the latter, an oscillatable lever connected to reciprocate the spindle while it rotates, a crankpin adjustably mounted on said rotatable member, a connecting rod engaging said pin and connected tosaid lever, and means carried by said rotatable member for adjusting saidpin to vary its eccentricity there- 'with and thereby vary the length of reciprocatory movement of the wheel spindle.

a rotatable member, direct driving connections between said spindle and said member to rotate the latter, an oscillatable lever pivotally mounted v in said frame, a crankpin 'adjust'ably positioned on said rotatablemembena connectingrod interposed between the crankpin and the end of said lever to oscillate'said lever, andalocating device to position said crankpin in one of several predetermined positions on said rotatable member to vary' its eccentricity therewith and to pro= duce reciprocatory movement of the grinding wheel spindle of the desired length.

11. In av device of the class described the combination of a support, bearings carried thereby, a j l spindle rotatable in and axially shiftable through the bearings, a member on said support movable axially with the spindle, an end thrust bearing for the spindle which is interposed between the- 2 and for looking said member and the spindle against axial displacement. 12. In a device of the class described the combination of a support, bearings carried thereby, a spindle rotatablein and axially shiftable through the bearings, said spindle having a normal definite position of rotation relative to the bearings, means for axially shifting the spindle from its normal position including a cam, means conv necting the cam with the spindle for rotation thereby, a member on said support movable axially with the spindle, an end thrust bearing interposed between the spindle and member, an assembly oscillatable by the cam, means for conf necting and disconnecting the assembly and the member and'additional means operable simultaneously with the. disconnecting means for looking the member and spindle against axial displacement in its normal rotating position. I 13. In a grinding machine the combination of a grinding wheel, a spindle for the wheel, means suppor'ting the spindle, a power'operated eccen tric 'for' effecting a reciprocation :of the spindle relative to its bearings, and a manually operated eccentric for disconnecting the power eccentric, from the spindle and for manuallyshifting the, I spindle-relative to its-bearings.- I

14. In a reciprocating attachment for use with grinding machines the combination with I a grinding. wheel, a spindletherefor, bearings for the.

spindle, a housing secured to'the spindle bearings,

; an eccentric journaled in the housing, means connecting theeccentric with the spindle for rotation thereby, means connecting the eccentric with the spindle for-effecting its reciprocation; a

manually operated eccentric .journaled in the" housing, and means operable by the manually- V actuable eccentric for disconnecting the'power operated eccentric from the spindle, stopping the reciprocationo f'the spindle and manually shift ing the spindle relativetoits bearings;

grinding machines the combination with a grinding wheel, a spindle thereforjbearingsforthe spindle, a housing securedto the spindlebea'rings, an eccentric journaled'in the housing, means con"- necting the eccentric withthe spindle forlrotation'thereby, means connecting the eccentricwith the spindle .for vveffecting its reciprocation, a'

manually operated eccentric yjournaled in: the

housing, meansoper'able ,by the manually actu- -t able eccentric for disconnecting the power operated eccentric from the spindle stopping the reciprocation of the spindle and manually shifting the spindle relatiye to its bearings, and ran anti-friction thrust bearing .in'the spindle con 1 nection with the power operated ecce'ntricwh'ereby the said spindle is reciprocated without retarding its rotation. c e

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